DISEASES OF PLANTS. 151 



ji possibility, however, of staiiiinfr tlie fruit if tlie mixture is applied within 

 2 or 3 weeks of the ripening period. On this account it is reconnnended that 

 the last api)lication be made not later than 4 weeks before the ripening period. 



Where curculio is present arsenate of lead at the rate of 2 lbs. to 50 gal. of 

 water may be used, the first si)raylng to consist of this insecticide, and to be 

 followed in 2 or 3 weeks with a coml)ination of lime sulphur and lead arsenate, 

 and a month later with the lime sulphur alone. Where the curculio is not 

 troublesome the arsenate of lead should be omitted, but 3 or 4 weeks after the 

 petals fall the trees should be sprayed with the self-boiled lime sulphur. This 

 should be followed with 2 applications, one in 3 weeks and the last about a 

 month before the fruit is expected to ripen. 



For scab alone one treatment of the lime sulphur applied about a month 

 after the petals drop will nearly control the disease, but if there is a possibility 

 of an epidemic a second spraying may be applied in 3 or 4 weeks. 



The peach leaf curl, A. Manakesi {Coltivatore, 56 (IDIO), No. 7, pp. 208- 

 211). — This is a brief discussion of the nature and methods of dissemination of 

 this fungus, together with the results obtained by using various fungicides in 

 attempts to control the disease. 



The control of the apple scab, F. Fischer {Ztschr. Pflanzenkrank., 19 {1909). 

 No. 7, pp. 432-43Jf; abs. in Rev. Patol. Vcg., 4 {1910), No. 7, pp. 97, 98).— The 

 author concludes after several years of attempts to control this disease {Ftisi- 

 cladium dOHlriticum) that there are no varieties of apples absolutely immune, 

 as some which are apparently resistant one year may be attacked the next 

 season. 



The fungus usually invades the fruit through injuries to the epidermis, which 

 permit the entrance of the germ tubes. The infection depends on the condition 

 of the weather. Cool nights alternating with warm days are favorable for the 

 dissemination of the fungus, especially if these conditions occur at the time of 

 seed formation in the young apples. In the spring before the leaves open is 

 reconnnended as the best time for the first application of Bordeaux mixture. 



A leaf disease of the cheri-y, E. Marre {Prog. Agr. et Vit. {Ed. VEst-Ccntre), 

 31 {1910), No. -',, pp. 121-123; Bui. Mens. Off. Renscig. Agr. [Parish, 9 {1910), 

 No. 1, pp. 2.'i-27). — In certain provinces of France a serious leaf disease of the 

 cherry has already materially decreased the yield and threatens to become 

 widespread. It was identified as Onomonia erythrostoma, a well-known fungus 

 in Austria and Germany. The general characters of the disease are given and 

 remedies suggested, such as burning the infected leaves in the fall and the use 

 of Bordeaux mixture to check its spread in the spring. 



The ascog-enous form, of the grape Oidium, V. Peglion {Atti R. Accad. 

 Liiirri, Reud. CJ. .S'cJ. Fis., Mat. e Nat., 5. scr., 18 {1909), IT, No. 10, pp. J^SS- 

 1)91). — Attention is called to the discovery during November in the vicinity of 

 Ferrara of perithecia associated with Oidium tuclceri. The perithecia belonged 

 to Uncinula necator and it is claimed that this is probably the ascogenous form 

 of the common grape Oidium. 



An epidemic of Spumaria on strawberries, L. ]\Iangin {Rrr. Ilort. [Paris], 

 81 {1909), No. 2.',, pp. 568, 569, figs. :2).— The prevalence of S. alba on the stems 

 and leaves of strawberry plants, producing an unsightly ajipearance and prob- 

 ably injuring the formation of fruit, is noted, together with a general descrip- 

 tion of the myxomycete and its development on the strawberry. Spraying with 

 a potassium sulphid solution 3:1,000 is recommended. 



Fungus diseases of the maguey, G. Gandara (Mrm. y Rev. Soc. Cienf. ".An- 

 tonio AJzate," 25 {1908-9), No. 9-12, pp. 293-305, pi. I. figs. 8).— Descriptions 

 and hosts are given for three well-known fungi parasitic on the u)agney (.igave 

 amcricana), namely, CoUciotrichutn ugares, Voniotliyrium concentricum, and 



